Now, I know this question has been asked many a time before, but I am going to attempt to clarify what this question is asking. I would like to know which game type awards the most REQ points per game, in the least amount of time, on average. For example, if an arena game is half as long as a Warzone game, and you earn over twice as many REQ points in a Warzone match, the Warzone game is a more efficient way to get REQ points. However, I also want to know which gametypes award the most on average, regardless of time, because sometimes you want to wean a lot of points, and you have no time constraints.
Swat is the best way to get req points per hour played but people are going to to tell you warzone assault.
WZ Assault worked for me
I would recommend Warzone Assault, too. You can get ~1200 RP in 5-15min, with boosts even more!